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wgtactical's avatar
wgtactical
Explorer
Aug 01, 2017

Anyone with a Cummins 5.9 commonrail and Allison 1000

Newbie here and I hope someone has a class A motorhome with a 5.9 Cummins commonrail with an Allison 1000 (six speed) transmission and can help me out. A few years back I purchased a engine/trans combo from a RV salvage yard, who removed it from a partially burned 2008 Monaco. The year was correct for the six speed so I didn't give it another thought. Well turns out the transmission is in fact a Gen 4 (which is six speed capable) but the CIN number for the transmission control module (TCM) is only calibrated for five speed operation, so five speeds is all the transmission is being told to shift through. If I can get the CIN number from a TCM that is programmed for six speeds, I can have mine calibrated for six speed as well. Any help will be appreciated!
  • It took about a 2 second search for the 2008 Cayman 340hp ISB. If you can find someone with that combo or search you should be able to find the specs on the trans.

    LEN
  • OLYLEN wrote:
    It took about a 2 second search for the 2008 Cayman 340hp ISB. If you can find someone with that combo or search you should be able to find the specs on the trans.

    LEN

    I believe that's a 6.7 not a 5.9?? and a 6 speed not a 1000 series
  • hostage wrote:
    OLYLEN wrote:
    It took about a 2 second search for the 2008 Cayman 340hp ISB. If you can find someone with that combo or search you should be able to find the specs on the trans.

    LEN

    I believe that's a 6.7 not a 5.9?? and a 6 speed not a 1000 series
    In 2005.5 the 1000 became a 6 speed. The OEM could program it to just use 5 speeds, but my 2006 1000 came as a six speed.